Meta-analysis of SHANK Mutations in Autism Spectrum Disorders: a gradient of severity in cognitive impairments.

PLoS Genet 2014 Sep 4;10(9):e1004580. Epub 2014 Sep 4.

Institut Pasteur, Human Genetics and Cognitive Functions Unit, Paris, France; CNRS UMR 3571 Genes, Synapses and Cognition, Institut Pasteur, Paris, France; University Paris Diderot, Sorbonne Paris Cité, Human Genetics and Cognitive Functions, Paris, France; FondaMental Foundation, Créteil, France.

SHANK genes code for scaffold proteins located at the post-synaptic density of glutamatergic synapses. In neurons, SHANK2 and SHANK3 have a positive effect on the induction and maturation of dendritic spines, whereas SHANK1 induces the enlargement of spine heads. Mutations in SHANK genes have been associated with autism spectrum disorders (ASD), but their prevalence and clinical relevance remain to be determined. Here, we performed a new screen and a meta-analysis of SHANK copy-number and coding-sequence variants in ASD. Copy-number variants were analyzed in 5,657 patients and 19,163 controls, coding-sequence variants were ascertained in 760 to 2,147 patients and 492 to 1,090 controls (depending on the gene), and, individuals carrying de novo or truncating SHANK mutations underwent an extensive clinical investigation. Copy-number variants and truncating mutations in SHANK genes were present in ∼1% of patients with ASD: mutations in SHANK1 were rare (0.04%) and present in males with normal IQ and autism; mutations in SHANK2 were present in 0.17% of patients with ASD and mild intellectual disability; mutations in SHANK3 were present in 0.69% of patients with ASD and up to 2.12% of the cases with moderate to profound intellectual disability. In summary, mutations of the SHANK genes were detected in the whole spectrum of autism with a gradient of severity in cognitive impairment. Given the rare frequency of SHANK1 and SHANK2 deleterious mutations, the clinical relevance of these genes remains to be ascertained. In contrast, the frequency and the penetrance of SHANK3 mutations in individuals with ASD and intellectual disability-more than 1 in 50-warrant its consideration for mutation screening in clinical practice.

Download full-text PDF

Source
http://dx.doi.org/10.1371/journal.pgen.1004580DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4154644PMC
September 2014
241 Reads

Publication Analysis

Top Keywords

shank genes
16
mutations shank
12
patients asd
12
mutations
10
coding-sequence variants
8
gradient severity
8
copy-number variants
8
intellectual disability
8
clinical relevance
8
severity cognitive
8
spectrum disorders
8
shank mutations
8
autism spectrum
8
meta-analysis shank
8
shank
6
asd
6
patients
5
genes
5
ascertained 760
4
deleterious mutations
4

Similar Publications